In the past few years much ink has been spilt discussing “mashups,” the process of remixing two or more songs together. The weirder the combination, the more impressive the feat. DJs like Girl Talk lead the charge, but due to differing keys and tempos the pairings sometimes sound forced. Mashup covers, on the other hand, have more freedom. Here are ten odd couples and unchained medleys that, defying all probably, kind of work.

Keller Williams – My Sisters and Brothers / Boob Job (Charles Johnson / David Wilcox)There’s something wonderfully irreverent about pairing a hopeful gospel song with a song called “Boob Job.” Jerry Garcia covered the first a few times, but died before he could have a go at the second. [Buy]

Saint Bernadette – Owner Things (Yes / Howard Jones)“Owner of a Lonely Heart” + “Things Can Only Get Better” = an inspired duo. Though I’m not sure Jones deserves the honor — a few years ago he translated his hit to “Simlish” for The Sims 2. Embarrassing. [Buy]

Jacqui Naylor – Summertime / Whipping Post (George Gershwin / The Allman Brothers)Jazz vocalist Naylor is known for her “acoustic smashes,” putting the lyrics to one song atop the melody of a second. Here she sings “Summertime” while the band plays “Whipping Post.” Sneak peek: Look for another even less likely pairing next week. [Buy]

Paddy Casey with the Dublin Gospel Choir – Grandma’s Hands / No Diggity (Bill Withers / Blackstreet)What seems a truly bizarre combination is actually an homage to the original “No Diggity,” which contained a “Grandma’s Hands” sample. This cover pushes that fun bit of trivia to the extreme. If someone covered Girl Talk this way each song would become a thirty-minute ordeal. [Buy]